ISBN 1091720118 books & textbook
EXCEEDINGLY HARD SUDOKU PUZZLE BOOK: 300 Insane Puzzles That Are More Difficult To Solve Than Einstein's Equations And For People Who Have IQ Above 180
Independently published /2019-03-27 Paperback / 304 Pages
isbn-10: 1091720118 / isbn-13: 9781091720114
